data: {
  id: "root",
  topic: "jsMind",
  children: [
    {
      id: "easy",
      topic: "Easy",
      direction: "left",
      expanded: false,
      children: [
        { id: "easy1", topic: "Easy to show" },
        { id: "easy2", topic: "Easy to edit" },
        { id: "easy3", topic: "Easy to store" },
        { id: "easy4", topic: "Easy to embed" },
      ],
    },
    {
      id: "open",
      topic: "Open Source",
      direction: "right",
      expanded: true,
      children: [
        { id: "open1", topic: "on GitHub" },
        { id: "open2", topic: "BSD License" },
      ],
    },
    {
      id: "powerful",
      topic: "Powerful",
      direction: "right",
      children: [
        { id: "powerful1", topic: "Base on Javascript" },
        { id: "powerful2", topic: "Base on HTML5" },
        { id: "powerful3", topic: "Depends on you" },
      ],
    },
    {
      id: "other",
      topic: "test node",
      direction: "left",
      children: [
        { id: "other1", topic: "I'm from local variable" },
        { id: "other2", topic: "I can do everything" },
      ],
    },
  ],
},